Improvement in locks for sliding doors



DH. H. DUTTERER.

Locks for Sliding-Doors. A

`No.149,729 Patentedvpril14,1874.

Eglfz.

UNITED STATES PATENT EEICEo DAVIS H. DOTTERER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN LOCKS FOR SLIDING DOORS.y

Specification forming part of Letters Patent No,.149,729, dated April 14, 1874; application filed Y February 21, 1874.

To all 'whom it may concern:

Beit known that I, DAvIs H. DOTTERER, of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a 'certain new and useful Improved Self-Acting accompanying drawings, which form part of this specification, in which- Figure l is a front view-of the carriage and lock in position for operation. Fig. 2 is an elevation, showing carriage plate removed, with internal arrangement of parts. Fig. 3 is a side elevation or end view, partly in section.

.My invention has for its object to provide a more perfect lock for the doors of freightcars than any heretofore produced, and to combine with said lock a carriage or rolling support for the door.

The nature of my invention consists, first, of a rolling or wheeled door-carriage, provided with a lock, the bolt of which locks into a notch in the rail; secondly, in the combination, with a lock mechanism, of a plate, having an extension,with a lip or hook passing be- A neath or embracing the rail below the door,

to prevent the latter from being raised for the purpose of obtaining access to the lock; thirdly, in the novel construction of the lock, comprising a pivoted or swiveled latch, locking automatically into a notch in the rail, and a tumbler which retains said latch in place when locked; and, fourtlily, in the combination,.

with a freight-car door and lock, of a rail, having two or more notches, so that the door may be locked when partially opened or entirely closed, all as hereinafter vmore fully described. j

Referring to the accompanying drawing, A is a freight-car door with my improvements applied; and B is the rail upon which said. door moves. C is the carriage or support, consisting of a metal plate secured to the lower part of the door, and affording bearings for the rollers E E, which ride upon the rail B. D is an extension of the plate C, having a lip, d, whichpasses beneath the lower edge ofthe rail, and which should be curved so as to form a hook, as shown in dotted lines, to embrace the lower edge of the rail, and therel by prevent the door from being raised or pried up for the purpose of obtaining access to the lock'or its latch G. F is the case or box of the lock, securely attached to the inner side of the plate C, and iitting in a recess formed in the door. G is the latch, turning or oscillating on the trunnions g, of which only one is shown in drawings, the corresponding one being on the opposite' side of the latch. 4H is a spring, which serves to keep the latch G pressed down upon the rail, and in the V- shaped notch therein, shown at b, when the door is closed. The tumbler'I and keyhub K are in their normal positions when the door is closed, as shown in full lines in the drawmg.

To unlock the door a key must be inserted at throwing back the tumbler I. The key is then withdrawn from@ and inserted at k, turning down the key-hub K upon the latch G, and raising its end out of the V-notch b in the rail. The door is then pushed back, still holding the key-hub K down upon the latch, until the lower end of the latter clears the notch b. To lock the door it is only necessary to slide it to a closed position, the latch at once entering the V-notch, and the tumbler I falling into position automatically.

b is a notch similar to b, and designed to enable the door to be locked or made fast when slid back a distance sufficient to alA low ventilation of the car, while preventing access by thieves.

The improvements herein described may be applied with advantage to other sliding doors besides those of freight-cars,nor do I limit my application of them to the latter.

-1. A rolling or wheeled door carriage proA vided withV a lock, the bolt' of which locks into a notch in the rail, substantially as shown and described.

2, In combination with a lock mechanism the plate C,'having the extension D, and lip or hook d passing beneath or embracing the rail below the door, so as to prevent it from locked when partially opened or entirely being pried up or raised for the purpose of closed, substantially as and for the purpose obtaining access to the lock.

3. The pivoted or sWveled latch G locking described.

In testimony that I claim the foregoing I automatically into the notch b in the rail, and have hereunto set my hand this 17th day of held down therein by the tumbler I, substantially as shown and described.

4. In combination with a freight-oar door and lock a rail to receive the bolt, having two or more notches, so that the door may be February, 1874.

DAVIS H. DOTTERER. Witnesses:

EUGENE P. EADsoN, JNO. A. BELL. 

